Life In A Noble Household 1641-1700 by Gladys Scott-Thomson, 1937, analyses the household accounts of William Russell, 1st Duke of Bedford. On page 236 is listed an entry from December 1690 where the Duke pays for the funeral of his huntsman, Thomas Nun.
Paid for a coffin and shroud, etc., for him, with 2s. to the searchers and 6s. for a certificate: £1 5s 0d.
I'm guessing that the certificate was for burial in wool. But what did the searchers do?